Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual posição há quando o concorrente principal é Vishal Singh e as pontuações são 1 + 7 + 5 = 13?
 ###Tabelas: CREATE TABLE week_4:_july_30_and_31_2008 (week_4:_july_30_and_31_2008_id AUTO_INCREMENT PRIMARY KEY, Main contestant VARCHAR, Co-contestant (Yaar vs. Pyaar) VARCHAR, Date performed VARCHAR, Scores by each individual judge VARCHAR, Total score/week VARCHAR, Position VARCHAR, Status VARCHAR) CREATE TABLE "tyler"__ ("tyler"___id AUTO_INCREMENT PRIMARY KEY, Model Number VARCHAR, Frequency VARCHAR, L2-Cache VARCHAR, Multiplier 1 VARCHAR, Voltage VARCHAR, Socket VARCHAR, Release date VARCHAR, Order Part Number VARCHAR) CREATE TABLE by_type (by_type_id AUTO_INCREMENT PRIMARY KEY, Rocket VARCHAR, Country VARCHAR, Family VARCHAR, Launches INT, Successes INT, Failures INT, Partial failures INT) CREATE TABLE year_by_year_performance (year_by_year_performance_id AUTO_INCREMENT PRIMARY KEY, Coach VARCHAR, Season VARCHAR, Record VARCHAR, Home VARCHAR, Away VARCHAR, Win % INT, Average (Total) Home Attendance VARCHAR) CREATE TABLE supersport_race_classification (supersport_race_classification_id AUTO_INCREMENT PRIMARY KEY, Rider VARCHAR, Bike VARCHAR, Laps INT, Time VARCHAR, Grid INT)  
SELECT Position FROM week_4:_july_30_and_31_2008 WHERE Main contestant = vishal singh AND Scores by each individual judge = 1 + 7 + 5 = 13